| NPS |
OD of a Flange (A) |
ID of a Flange (B) |
Number of Bolts |
Diameter of Bolt Circle (C) |
Thickness of Flange(T) |
|---|---|---|---|---|---|
| 4 | 9.00 | 4.57 | 8 | 7.50 | 1.125 |
| 5 | 10.00 | 5.66 | 8 | 8.50 | 1.188 |
| 6 | 11.00 | 6.72 | 8 | 9.50 | 1.313 |
| 8 | 13.50 | 8.72 | 8 | 11.75 | 1.500 |
| 10 | 16.00 | 10.88 | 12 | 14.25 | 1.563 |
| 12 | 19.00 | 12.88 | 12 | 17.00 | 1.750 |
| 14 | 21.00 | 14.19 | 12 | 18.75 | 1.875 |
| 16 | 23.50 | 16.19 | 16 | 21.25 | 2.000 |
| 18 | 25.00 | 18.19 | 16 | 22.75 | 2.125 |
| 20 | 27.50 | 20.19 | 20 | 25.00 | 2.375 |
| 22 | 29.50 | 22.19 | 20 | 27.25 | 2.500 |
| 24 | 32.00 | 24.19 | 20 | 29.50 | 2.625 |
| 26 | 34.25 | 24 | 31.75 | 2.750 | |
| 28 | 36.50 | 28 | 34.00 | 2.750 | |
| 30 | 38.75 | 28 | 36.00 | 2.875 | |
| 32 | 41.75 | 28 | 38.50 | 3.000 | |
| 34 | 43.75 | 32 | 40.50 | 3.050 | |
| 36 | 46.00 | 32 | 42.75 | 3.209 | |
| 38 | 48.75 | 32 | 45.25 | 3.394 | |
| 40 | 50.75 | 36 | 47.25 | 3.533 | |
| 42 | 53.00 | 36 | 49.50 | 3.695 | |
| 44 | 55.25 | 40 | 51.75 | 3.857 | |
| 46 | 57.25 | 40 | 53.75 | 3.997 | |
| 48 | 59.50 | 44 | 56.00 | 4.159 | |
| 50 | 61.75 | 44 | 58.25 | 4.327 | |
| 52 | 64.00 | 44 | 60.50 | 4.489 | |
| 54 | 66.25 | 44 | 62.75 | 4.651 | |
| 60 | 73.00 | 52 | 69.25 | 5.116 | |
| 66 | 80.00 | 52 | 76.00 | 5.601 | |
| 72 | 86.50 | 60 | 82.50 | 6.066 |
1. Ring flanges may be overbored or counterbored to accommodate larger outside-diameter (OD) pipe than shown as nominal. This is done to allow a clear inside diameter (ID) after cement-mortar lining. Wrench clearance between the pipe OD and bolt circle, as well as sufficient gasket seating area, must be maintained.
2. Metric conversion—nominal pipe size: in. × 25 = mm; dimensions: in. × 25.4 = mm; psi × 6.895 = kPa.
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